Merge pull request #52 from TEAM-DHS/feat/member

[FIX] 인증 정보 찾지 못했을 경우 예외를 던지지 않고 null 리턴

src/main/java/com/efub/dhs/global/utils/SecurityUtils.java

@@ -1,16 +1,14 @@
 package com.efub.dhs.global.utils;
 
-import org.springframework.http.HttpStatus;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
-import org.springframework.web.server.ResponseStatusException;
 
 public class SecurityUtils {
 
 	public static String getCurrentUsername() {
 		Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
 		if (authentication == null || authentication.getName() == null) {
-			throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "There is no authentication information.");
+			return null;
 		}
 		return authentication.getName();
 	}